131221031113 has 4 divisors (see below), whose sum is σ = 131222745220. Its totient is φ = 131219317008.

The previous prime is 131221031099. The next prime is 131221031131. The reversal of 131221031113 is 311130122131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 311130122131 = 181 ⋅1718950951.

It can be written as a sum of positive squares in 2 ways, for example, as 56094606649 + 75126424464 = 236843^2 + 274092^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131221031113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221031143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736578 + ... + 897211.

It is an arithmetic number, because the mean of its divisors is an integer number (32805686305).

Almost surely, 2^131221031113 is an apocalyptic number.

It is an amenable number.

131221031113 is a deficient number, since it is larger than the sum of its proper divisors (1714107).

131221031113 is an equidigital number, since it uses as much as digits as its factorization.

131221031113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714106.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 131221031113 its reverse (311130122131), we get a palindrome (442351153244).

The spelling of 131221031113 in words is "one hundred thirty-one billion, two hundred twenty-one million, thirty-one thousand, one hundred thirteen".